Dorrough 40-A Specifications download pdf (Page 17)

If you select ‘User’, two additional folders open up called Loudness Setup and Loudness Option.

These two folders enable you to completely customize the Loudness measurement to your exact specifications.

Loudness Setup

The Loudness Setup folder allows you to customize the loudness settings of your meter.

You may use one of the Loudness presets as a starting point.

Filter

Range: LEQM, K-Filter, Off

Sets weighting filter applied to the Loudness measurement.

ITU BS1770 loudness recommendation (R128, A/85) specifies K-filter weighting.

Scale Mode

Range: LU, LUFS, LKFS

The LU scale allows for a relative reference point in the loudness e.g. EBU R128 will mean 0LU=-

23LUFS, while SMPTE A/85 would mean 0LU = -24LKFS. The specific reference point may be

chosen via the ‘Reference’ parameter explained below.

LUFS and LKFS scales are identical scales, LUFS being used by EBU, while LKFS is used by

SMPTE.

Short-term Window

Range: Momentary, 3, 10 or 30 seconds.

The currently displayed loudness value is based on the averaged loudness values over the

defined time window. Setting the window to ‘Momentary’ essentially turns the Short-term

loudness reading into ‘Momentary’ loudness based on a sliding 300ms window. Please note that

the PAM PICO TOUCH already offers the Momentary reading alongside the Short-term loudness.

Reference

Range: -9 and -24 dBFS (1 dB steps).

A range of Reference levels can be chosen for the purpose of loudness measurement as part of

the loudness measurement standard which your organization (or client) has adopted.

EBU R128 specifies -23LUFS as the reference point.

SMPTE A/85 specifies -24LKFS as the reference point.

Peak Level

Range: -1 to -10 dBFS (1 dB steps).

The Peak level is a user defined reference point.

The peak level is dependent on the setting of ‘Peak Mode’; True Peak or Digital (Sample Peak).

When the signal passes above the peak level, the Peak level readout will turn Red.

Tip: Select the Loudness Preset that comes closest to your desired loudness setting, then select the ‘User’

Loudness Preset in order to customize the details.

Your changes will automatically be saved to the current preset.

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Dorrough 40-A Specifications Page 17